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J, WILLIAMSON 8a J. 8; GfS-WINDELLS.

' LETTING OPP MOTION TOR LDOMS.

Patented June 19,1883.

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J. WILLIAMSON 8v J. & G. SWINDELLS.

. LETTING OPP MOTION POR LoOMs.

No. 279,626. Patented June 19,1883.

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UNITED STATES4 PATENT OFFICE.

JAMES VILLIAMSON, JOHN SVINDELLS, AAND GEORGE SVINDELLS, (.)F LANCASTER, ENGLAND.

LETTING-OFF MOT-ION vFOR LOOMS.

SPECIFICATION forming part of Letters APatent No. 279,626, dated June 19, 1883.

Application tiled October 22, 1881. (No model.) Patented in England December l0. 18H0. No. 5,163, and in France .Tune li, 1.981,

Nn. 143,390. v

To all whoml it may concern:

Be it known that we, J AMEs WILLIAMSON, JOHN SWINDELLs, and GEORGE SWINDELLs', of Lancaster, in the Kingdom of Great Britain, have invented a new and useful Improvement in Letting-Off Motions for Looms, (for which we have obtained a patent in Great Britain, bearing date December l0, A. D. 1880, No. 5,163, and a patent 'in France, bear ing dat@ June 13, 1881, No. 14's, 390,) of which the following is a specification.

This invention consists of an improved letting-off motion Afor looms, and has for its object to automatically weight and let off the yarn from the Warp-beam, so that only as much is let oit as is taken up, and to secure thel maintenance of a constant and uniform tension of the warp from the beginning to the end without adjustment after the first setting.

In order that the invention may be more readily understood and 'carried into effect,

there is hereunto annexed a sheet of drawings,

in whichn -Figure l is a transverse section, on the line A'B of Fig. 3, of. a loom having our improve p ment applied thereto. 2 is an enlarged side viewer" the tilting cam and its lever. Fig. 3 is a rear view of a loom showing our improvement.

In these figures, H represents a horizontal lever applied to the warp-beam, I. To this horizontal. lever is jointed a vertical arm, K. The lever H is pivoted on'a pin, A, secured to the loom-side. vThe ends of the horizontal lever H and of the vertical arm K, connected thereto, are hollowed out, so as to closely embrace the greater part of the circumference of the neck of the warp-beam. The lever H and vertical arm K are connected by a spiral or Vother spring, L, the tension of which causes over a bar or rest, E, at the back ofthe loom.

The upper part of the vertical arm K is so arranged that it comes in proximity to the back top corner of the loom-side, upon which there is fixed a bracket or bearing carrying a movable cam or contact-piece, D.

As the taking-up motion proceeds the warpbeam is lifted and carries with it the jointed lever and arm H K, and the upper end, F, of

the arm K is thus brought with a graduallyincreasing pressure against the cam D. As

soon as this pressure equals or exceeds the ten.-

sion of the spring L the grip exerted upon the neck of the warp-beam by the clamp H K is released, and the warp-beam, actuated by that portion of its weight unbalanced by the weight G, revolves and falls, carrying with it in its descent the jointed clamp H K. The part F being thus removed from contact with the cam D, the clamp becomes free to again grip the neck of the warp-beam, the further revolution and descent of which are thus prevented.

This cycle or series of movemeni'sis automatically repeated as Often as may be, demanded by the process of weaving and by the takingup motion.

Two brackets, C C, may be attached to the backs of the loom-frames to form a temporary support for the warp-.beam and to arrest its fall when requisite.

. NVhen it is necessary to rewind the warpy not be stopped. y However, it is notI necessary to employ more than a single set ol' the devices.

XV e claiml. The combination, with the warp-beam of a loom, of the arm K and weighted lever H,

l@he spring L, and theeam aiid its haidle, subl speeieation in the presence of two subsol'btio stautia'lly as set forth. ingwtnesses.

2. The combination, with the Warp-beam of Y T in loom, of the arm K, having :1,11 end, F, and 5 the lever H, said arm and lever being curved l GEORGE SVHNDET'LS or hollowed out to adapt them to surround the J neck of Said beam, .the spring L, and @am D, XVtnesses:

having the 11 andle M, substantially as set forth. NVILLIAM JOHNSON,

In testimony whereof We have signed this FREDERICK SMALLMAN. 

